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Barn (unit)
A barn is a unit of area, equal to 10-28 m2[?]. Although not an official SI unit, it is widely used by nuclear physicists as it is considered to be "as big as a barn" compared to the typical cross sections for nuclear reactions[?].
External links
- IUPAC citation for this usage of "barn" (http://www.iupac.org/goldbook/B00598.pdf)
- http://www-ed.fnal.gov/painless/htmls/cross
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